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Frontiers in Phononics: Parity-Time Symmetric Phononic Metamaterials

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Publications

Flat Bands in Magic-Angle Vibrating Plates

Author(s): María Rosendo López, Fernando Peñaranda, Johan Christensen, Pablo San-Jose
Published in: Physical Review Letters, 125/21, 2020, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/physrevlett.125.214301

Ultrasonic nodal chains in topological granular metamaterials

Author(s): Aurélien Merkel, Johan Christensen
Published in: Communications Physics, 2/1, 2019, ISSN 2399-3650
Publisher: Nature Partner Journals
DOI: 10.1038/s42005-019-0256-z

Slow Surface Acoustic Waves via Lattice Optimization of a Phononic Crystal on a Chip

Author(s): Si-Yuan Yu, Ji-Qian Wang, Xiao-Chen Sun, Fu-Kang Liu, Cheng He, Huan-Huan Xu, Ming-Hui Lu, Johan Christensen, Xiao-Ping Liu, Yan-Feng Chen
Published in: Physical Review Applied, 14/6, 2020, ISSN 2331-7019
Publisher: American Physical Society
DOI: 10.1103/physrevapplied.14.064008

Mechanical Analogue of a Majorana Bound State

Author(s): Chun‐Wei Chen, Natalia Lera, Rajesh Chaunsali, Daniel Torrent, Jose Vicente Alvarez, Jinkyu Yang, Pablo San‐Jose, Johan Christensen
Published in: Advanced Materials, 31/51, 2019, Page(s) 1904386, ISSN 0935-9648
Publisher: United Nations Industrial Developement Organization
DOI: 10.1002/adma.201904386

Topological Sound Pumping of Zero‐Dimensional Bound States

Author(s): Penglin Gao, Johan Christensen
Published in: Advanced Quantum Technologies, 3/9, 2020, Page(s) 2000065, ISSN 2511-9044
Publisher: Advanced Quantum Technologies (Wiley-VCH GmbH, Weinheim)
DOI: 10.1002/qute.202000065

Subwavelength multiple topological interface states in one-dimensional labyrinthine acoustic metamaterials

Author(s): Zhiwang Zhang, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Physical Review B, 99/22, 2019, ISSN 2469-9950
Publisher: American Physical Society
DOI: 10.1103/physrevb.99.224104

Multiple scattering theory of non-Hermitian sonic second-order topological insulators

Author(s): María Rosendo López, Zhiwang Zhang, Daniel Torrent, Johan Christensen
Published in: Communications Physics, 2/1, 2019, ISSN 2399-3650
Publisher: Nature Research
DOI: 10.1038/s42005-019-0233-6

Dynamic Nonreciprocity in Loss-Compensated Piezophononic Media

Author(s): Aurélien Merkel, Morten Willatzen, Johan Christensen
Published in: Physical Review Applied, 9/3, 2018, ISSN 2331-7019
Publisher: American Physical Society
DOI: 10.1103/physrevapplied.9.034033

Optical force rectifiers based on PT-symmetric metasurfaces

Author(s): Rasoul Alaee, Burak Gurlek, Johan Christensen, Muamer Kadic
Published in: Physical Review B, 97/19, 2018, ISSN 2469-9950
Publisher: American Physical Society
DOI: 10.1103/physrevb.97.195420

Optical Pulling and Pushing Forces in Bilayer P T -Symmetric Structures

Author(s): Rasoul Alaee, Johan Christensen, Muamer Kadic
Published in: Physical Review Applied, 9/1, 2018, ISSN 2331-7019
Publisher: APS
DOI: 10.1103/PhysRevApplied.9.014007

Experimental verification of acoustic pseudospin multipoles in a symmetry-broken snowflakelike topological insulator

Author(s): Zhiwang Zhang, Ye Tian, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Physical Review B, 96/24, 2017, ISSN 2469-9950
Publisher: APS
DOI: 10.1103/PhysRevB.96.241306

Valley Hall phases in kagome lattices

Author(s): Natalia Lera, Daniel Torrent, P. San-Jose, J. Christensen, J. V. Alvarez
Published in: Physical Review B, 99/13, 2019, ISSN 2469-9950
Publisher: APS
DOI: 10.1103/PhysRevB.99.134102

Directional Acoustic Antennas Based on Valley-Hall Topological Insulators

Author(s): Zhiwang Zhang, Ye Tian, Yihe Wang, Shuxiang Gao, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Advanced Materials, 30/36, 2018, Page(s) 1803229, ISSN 0935-9648
Publisher: United Nations Industrial Developement Organization
DOI: 10.1002/adma.201803229

Topological sound

Author(s): Xiujuan Zhang, Meng Xiao, Ying Cheng, Ming-Hui Lu, Johan Christensen
Published in: Communications Physics, 1/1, 2018, ISSN 2399-3650
Publisher: NPG
DOI: 10.1038/s42005-018-0094-4

Non-Hermitian Sonic Second-Order Topological Insulator

Author(s): Zhiwang Zhang, María Rosendo López, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Physical Review Letters, 122/19, 2019, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/PhysRevLett.122.195501

Valley Physics in Non-Hermitian Artificial Acoustic Boron Nitride

Author(s): Mudi Wang, Liping Ye, J. Christensen, Zhengyou Liu
Published in: Physical Review Letters, 120/24, 2018, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/PhysRevLett.120.246601

Unidirectional zero sonic reflection in passive PT -symmetric Willis media

Author(s): Aurélien Merkel, Vicent Romero-García, Jean-Philippe Groby, Jensen Li, Johan Christensen
Published in: Physical Review B, 98/20, 2018, ISSN 2469-9950
Publisher: APS
DOI: 10.1103/PhysRevB.98.201102

Ultrathin acoustic parity-time symmetric metasurface cloak

Author(s): Li, Hao-Xiang; Rosendo-Lopez, Maria; Zhu, Yi-Fan; Fan, Xu-Dong; Torrent, Daniel; Liang, Bin; Cheng, Jian-Chum; Christensen, Johan
Published in: SPJ Research, 1, 2019, ISSN 2058-8437
Publisher: Under review in SPJ Research

Topological Acoustic Delay Line

Author(s): Zhiwang Zhang, Ye Tian, Ying Cheng, Qi Wei, Xiaojun Liu, Johan Christensen
Published in: Physical Review Applied, 9/3, 2018, ISSN 2331-7019
Publisher: APS
DOI: 10.1103/PhysRevApplied.9.034032

Deep‐Subwavelength Holey Acoustic Second‐Order Topological Insulators

Author(s): Zhiwang Zhang, Houyou Long, Chen Liu, Chen Shao, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Advanced Materials, 31/49, 2019, Page(s) 1904682, ISSN 0935-9648
Publisher: United Nations Industrial Developement Organization
DOI: 10.1002/adma.201904682

Sonic valley-Chern insulators

Author(s): Penglin Gao, Zhiwang Zhang, Johan Christensen
Published in: Physical Review B, 101/2, 2020, ISSN 2469-9950
Publisher: American Physical Society
DOI: 10.1103/physrevb.101.020301

Pseudospin induced topological corner state at intersecting sonic lattices

Author(s): Zhiwang Zhang, Bolun Hu, Feng Liu, Ying Cheng, Xiaojun Liu, Johan Christensen
Published in: Physical Review B, 101/22, 2020, ISSN 2469-9950
Publisher: American Physical Society
DOI: 10.1103/physrevb.101.220102

Anomalous Topological Edge States in Non-Hermitian Piezophononic Media

Author(s): Penglin Gao, Morten Willatzen, Johan Christensen
Published in: Physical Review Letters, 125/20, 2020, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/physrevlett.125.206402